OVP Power Converter | Full Output Power at any Impedance.In theory, an amplifier that delivers 500 watts into an 8-ohm load, offers analogous to Ohm's law 2.000 watts to a 2-ohm load. In practice, many amps deliver 65% -77% of the theoretical 4-ohm power at 2 ohms only. The resulting losses come from the voltage power supply and from the current limitations of the output stages. The current limiter in the output stage generates additional distortion, which has to do with the impedance curve of the loudspeaker connected. The speaker represents a dummy load to the amplifier. A large part of the energy is returned to the amplifier and may activate the current protection circuit (current limiter) externally. The NOVA Over-Voltage Protection (OVP) is a special power converter that can deliver more power than it has previously taken from the power supply. Due to this, it delivers the required current even at lower impedances. To drive a higher impedance (such as a speaker with an impedance of 8 ohms) a higher voltage is required. Using the OVP switch (not in XPS 900 model), the user can adjust the NOVA XPS amplifiers exactly to the impedance of the loudspeaker connected.

► Full power output even at low impedances

Class-DH | Sounds like "Class-H" - Efficient like "Class-D“.A class-H amplifier is basically a class-AB amplifier, the supply voltage can be changed in dependence on the signal. At high power output levels of the amplifier, the class-H design is used to reduce the voltage drop and dissipation power in the output transistors considerably. The voltage increase is split at class-H amplifiers in 2 or 3 stages in the power supply. Disadvantages of class-H are the higher circuit complexity and low distortion when switching to the higher voltage level. The efficiencies of class-H amplifiers are between 60% to over 80%, depending on the circuit design. Class-DH is the evolution of the class-H technology. Class-DH has all the advantages of the class-H technology, but without switching to any higher or lower voltage level(s). Class-DH amplifiers are equipped with a dynamic adaptive voltage regulator that regulates the supply voltage continuously. The usually occuring distortion when switching to the higher supply voltage, is typically for class-H amplfiers. This kind of distortion does not occur in class-DH amplifiers at all. The efficiencies of the class-DH amplifiers are over 90% at full load.

► Distortion-free sound due to continuous control of the supply voltage► Higher efficiency and less power consumption► Less heat by very low power loss

Integrated Crossover for increased Flexibility.For larger and more complex speaker systems, we recommend using a digital loudspeaker management system, which takes over the function of a crossover. For smaller systems, such as a system consisting of two 18" subwoofers and two 2-way mid/high loudspeakers, the users often rely on cost efficiency and flexibility. Therefore, all NOVA XPS amplifiers are equipped with a high pass filter (120 Hz / 18 dB / Butterworth) and a low-pass filter (120 Hz / 18 dB / Butterworth). The filter type can be selected on the rear side of the XPS amplifiers by using a switch. The crossover function is disabled in position FULLRANGE.

► High flexibility and cost-effective configuration of smaller systems

Undistorted Bass Independent from Voltage.The core of the NOVA XPS amplifiers is the variable SMPS switching power supply, which provides stable performance even with voltage fluctuations in the mains supply (~230V +/-10%). The power supply is designed specifically for the NOVA class-DH amplifier technology. It provides a stable power supply for uncompromising performance even at full load and low-impedance. The use of this highly efficient power supply also leads to a very low weight of the XPS power amplifiers.

► Stable performance at full load and fluctuating voltage from the mains► Stable bass reproduction even at full load► Lightweight